
<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.sql.*" %>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>

    <title>学生数据库</title>
</head>

<body>
<h1>这是一个JSP文件。</h1>
<%
//判断用户是否登录
    if(session.getAttribute("isLogin")== null){
        //没有登录，跳转到Login.jsp
        response.sendRedirect("login.jsp");
    }
%>
<%
    //任务：设置版权信息，两种方式

    //解决中文乱码
    out.write("hello,world!");
    out.write("<h1>hello,world!</h1>");
    // out.write("怎么总是出现500");
%>

<style type="text/css">

    table {
        border: 1px solid #000;
        border-collapse: collapse;
    }

    td {
        border: 1px solid #000;
        padding: 10px;
    }

</style>


<table>

    <thead>
    <tr>
        <th>编号</th>
        <th>用户名</th>
        <th>密码</th>
        <th>操作1</th>
        <th>操作2</th>
    </tr>
    </thead>




    <%
     //  class User {
        //    int id;
        //    String username;
         //   String password;

            // alt + insert
        //    public User(int id, String username, String password) {
          //      this.id = id;
            //    this.username = username;
              //  this.password = password;
           // }
       // }
        class User {
            int id;
            String name;
            String password;

            // alt + insert
            public User(int id, String name, String password) {
                this.id = id;//this表示类或者对象的所有者
                this.name = name;
                this.password = password;
            }
        }


        request.setCharacterEncoding("utf-8");
        List<User> list = new ArrayList<User>();



        // 3 + 1
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        String sql = "select * from t_users";

        Class.forName("com.mysql.jdbc.Driver");


        connection = DriverManager.getConnection(
                "jdbc:mysql://localhost:3306/sctu_javaweb_2018?serverTimezone=UTC",
                "root",
                "123456"
        );


        statement = connection.createStatement();

        resultSet = statement.executeQuery(sql);

        while(resultSet.next()){

            int id = resultSet.getInt(1);
            String username = resultSet.getString(2);
            String password = resultSet.getString(3);

            User user = new User(id, username, password);
            list.add(user);

        }
        resultSet.close();
        statement.close();
        connection.close();



        for (User user : list) {

            out.write("<tr><td>" + user.id + "</td><td>" + user.name
                    + "</td><td>" + user.password + "</td>" +
                    "<td><a href='userDeleteHandler.jsp?id="+user.id+"'>删除</a></td>" +
                    "<td><a href='userUpdate.jsp?id="+user.id+"&username="+user.name+"&password="+user.password+"'>更新</a></td></tr>");
        }//后面为什么加了user.name这些东西
    %>
    </tbody>

    <tfoot>
    <td><a href="userAdd.jsp"> 添加用户</a> </td>
    </tfoot>
</table>
<!--JSP动作  jsp前缀:include-->
<p>版权信息：四川旅游学院所属</p>
<%@include file="fooder.jsp"
%>
<jsp:include page="fooder.jsp">
    <jsp:param name="year" value="2018"/>

</jsp:include>
</body>
</html>
